A math-expression parser, evaluator and formatter for Elixir.

Features

Supported operators

• +, -, /, *
• Exponentials with ^
• Factorial (n!)
• Bitwise operators
  • << >> bitshift
  • & bitwise and
  • | bitwise or
  • |^ bitwise xor
  • ~ bitwise not (unary)
• Boolean operators
  • &&, ||, not
  • ==, !=, >, >=, <, <=
  • Ternary condition ? if_true : if_false

Supported functions

• sin(x), cos(x), tan(x)
• round(n, precision = 0), ceil(n, precision = 0), floor(n, precision = 0)

Reserved words

• true
• false
• null

Access to variables in scope

• a with scope %{"a" => 10} would evaluate to 10
• a.b with scope %{"a" => %{"b" => 42}} would evaluate to 42
• list[2] with scope %{"list" => [1, 2, 3]} would evaluate to 3

Data types

• Boolean: true, false
• None: null
• Integer: 0, 40, -184
• Float: 0.2, 12., .12
• String: "Hello World", "He said: "Let's write a math parser""

If a variable is not in the scope, eval/2 will result in {:error, error}.